what is the reason people die naturally even though they have no known disease?
I see people become physically weak at times they get old and die eventually in case they are not attacked by any known ...

I have recently found articles and various claims that turtles (Blanding's turtles as an exact example) could possibly live indefinitely. http://discovermagazine.com/2002/jun/featturtle
This is said ...

I know that some plants die for old age like a
lettuce. But there are trees like Baobabs or larger Ficus in the tropics of whom we don't know their age. And trees like spruce reaching 9950 years old, ...

I understand (a little) that there are biological clocks and reason that after a certain amount of time organisms die. I'm wondering if that is something inherent in our DNA or in biology/chemistry in ...

After reading the answer to Does our DNA change during our lives?, I was wondering if and how it would be possible to change the structure of the 13 loci that are used in the CODIS database, in such a ...

Is it true that people become gradually shorter as they age?
If it is, is it more common in one gender than the other?
And is it known what triggers this? (Considering that the "shortening" probably ...

Ok, this may be just wild nonsense and I have to warn that my knowledge on the subject is limited.
I was reading about how in some countries people choose to have children later in life. After that ...

I was watching sea birds eating fishes and wondered if fishes actually died from old age, or if they are all eaten before this can happen?
I reckon some big predator fishes must be able to live long ...

Many have heard about the fabled "immortal" jellyfish, Turritopsis dohrnii, which doesn't die from aging (senescence) and can revert the aging process indefinitely. It is rather remarkable that only ...

Ever since learning that the shortening of telomeres is linked to aging I've tried to figure out what causes cells to divide, and if it's possible to slow down the rate of cell division through life ...

I am trying to understand the effect of aging on the sympathetic fibers of SA node.
I know that aging shifts the vagal curve to left in frequency due to aging.
However, I am interested if aging has ...

I meat a overtrained friend (25 years old) who cannot rest.
He has all muscles and most of the skin very tense.
He is practising regularly in gym and sleep badly.
He moves like a stick figure and has ...

Antioxidants reduce damage to tissue (by scavenging the free radicals) and thus may reduce ageing.It is known that Uric acid is a very good antioxidant.
People with gout have excess accumulation of ...

I know that we age because of errors in the cell replication process and these errors eventually leads to death.
If we exclude environmental factors, are there any other factors that can cause these ...

I have palpated many hard organs during my work and studies.
I have seen many young and old people who have hard organs, like very hard shoulder - very common.
I have interviewed some of them, some ...

Question:
How does the telomeric repeating sequence vary in non-vertebrate Eukaryotes? If you know the repeating sequence of a given species I would appreciate hearing it.
Background:
Telomerase is ...

When the telomerase enzyme is not active the telomere shortens every time the cell duplicates leading to a reproductive limit (Hayflicks limit).
On one hand this is a believed reason for aging. On the ...

I heard the hypothesis, that the (main) reason of aging is the increasing number of mutations in body tissues. The higher the number of mutations is, the older tissue is.
Is this true? And how well ...

I have searched the net and I have not been able to come up with an clear answer.
Edit: Here is the para quoted from Nature http://www.nature.com/news/medical-research-cell-division-1.13273
"So began ...

Do organisms exist that are able to live indefinitely if they are not killed by external factors?
Under external factors I would consider things like predators and natural disaster but not illness by ...

The question "why do we age" has been asked numerous times. But why are we young? The cells of the adult human being are an age (time>0), but how can old cells create new cells that are younger than ...

A world class athlete spends a lot of time performing intense exercises. Correct me if I'm wrong, but I assume that these intense exercises causes significant damage to the athlete's cells, but with ...

I have heard that the Hydra organism is biologically immortal (later I found that there are more immortal organisms). Now I know that its immortality is related to its telomerase. The thing is that we ...

From what I have read and understood telomeres cap off how many times a cell can divide before it can no longer divide and that is what causes aging.
A thale cress plant apparently has a life cycle ...

I was watching a talk by Michio Kaku and he mentioned that crocodiles (or possibly alligators, I forget offhand) don't actually age -- they can die, but they essentially go through no aging process ...